unexpired - valid, remaining, still in force⏎
zero hour - departure, beginning (of operation)⏎
transfer - move over, carry, duplicate, displace⏎
short-staffed - Short-handed, understaffed⏎
vacant - empty, not being used⏎
vacation - holiday⏎
secure - safe, protected, achieve (something)⏎
scrap - cancel, annul, piece, stop using⏎
top flight - best, most successful, highest⏎
valid - genuine, legally or officially acceptable⏎